/*
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Hessian", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */

package com.caucho.hessian.io;

import java.io.IOException;
import java.util.*;
import java.lang.reflect.*;

/**
 * Deserializing a JDK 1.2 Map.
 */
public class MapDeserializer extends AbstractMapDeserializer {
	private Class<?> _type;
	private Constructor<?> _ctor;

	public MapDeserializer(Class<?> type) {
		if (type == null)
			type = HashMap.class;

		_type = type;

		Constructor<?>[] ctors = type.getConstructors();
		for (int i = 0; i < ctors.length; i++) {
			if (ctors[i].getParameterTypes().length == 0)
				_ctor = ctors[i];
		}

		if (_ctor == null) {
			try {
				_ctor = HashMap.class.getConstructor(new Class[0]);
			} catch (Exception e) {
				throw new IllegalStateException(e);
			}
		}
	}

	public Class<?> getType() {
		if (_type != null)
			return _type;
		else
			return HashMap.class;
	}

	public Object readMap(AbstractHessianInput in) throws IOException {
		Map map;

		if (_type == null)
			map = new HashMap();
		else if (_type.equals(Map.class))
			map = new HashMap();
		else if (_type.equals(SortedMap.class))
			map = new TreeMap();
		else {
			try {
				map = (Map) _ctor.newInstance();
			} catch (Exception e) {
				throw new IOExceptionWrapper(e);
			}
		}

		in.addRef(map);

		while (!in.isEnd()) {
			map.put(in.readObject(), in.readObject());
		}

		in.readEnd();

		return map;
	}

	@Override
	public Object readObject(AbstractHessianInput in, Object[] fields) throws IOException {
		String[] fieldNames = (String[]) fields;
		Map<Object, Object> map = createMap();

		int ref = in.addRef(map);

		for (int i = 0; i < fieldNames.length; i++) {
			String name = fieldNames[i];

			map.put(name, in.readObject());
		}

		return map;
	}

	private Map createMap() throws IOException {

		if (_type == null)
			return new HashMap();
		else if (_type.equals(Map.class))
			return new HashMap();
		else if (_type.equals(SortedMap.class))
			return new TreeMap();
		else {
			try {
				return (Map) _ctor.newInstance();
			} catch (Exception e) {
				throw new IOExceptionWrapper(e);
			}
		}
	}
}
